Gordy Megroz

Itsy bitsy? Sure, but spiders loom large in hiker phobias. They shouldn't: Only a few subspecies of the black widow and brown recluse can inflict enough damage to cut short a hike. Here's what you need to know about North America's most venomous spiders, from how to avoid them to treating their bites.

With 1 million bears roaming North America, chances are pretty good that you'll cross paths with one of them at some point. To make every encounter safe, from grizzly bears to black bears, bone up on bruin identification and etiquette.